Air operated piston pump



FIG. 1 is a front elevation view of the air operated piston pump;

FIG. 2 is a top elevation view thereof;

FIG. 3 is a left side elevation view thereof;

FIG. 4 is a right side elevation view thereof;

FIG. 5 is a back elevation view thereof; and,

FIG. 6 is a bottom elevation view thereof. 

The ornamental design for the air operated piston pump, as shown and described. 